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A carbon nanotube field emission cathode with high current density and long-term stability
Xiomara Calderón-Colón1, Huaizhi Geng, Bo Gao
1Curriculum in Applied Science and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
Nanotechnology
|July 22, 2009
Summary
We developed an electrophoretic process to create advanced carbon nanotube (CNT) films, significantly improving electron emission for vacuum electronics and x-ray imaging applications.
Area of Science:
- Materials Science
- Vacuum Electronics
- Nanotechnology
Background:
- Carbon nanotube (CNT) field emitters face challenges like short lifetimes and instability in vacuum electronic applications.
- Issues such as poor emission uniformity and pixel inconsistency hinder practical device implementation.
Purpose of the Study:
- To develop an improved fabrication process for CNT field emitters.
- To address limitations in current density, stability, and uniformity for CNT-based devices.
Main Methods:
- Fabrication of composite CNT films using an electrophoretic process.
- Controlled manipulation of nanotube orientation and surface density.
- Enhancement of film adhesion to the substrate.
Main Results:
- Achieved significantly enhanced macroscopic field emission current density.
- Demonstrated long-term stability under high operating voltages.
- Successfully applied the CNT electron source for high-resolution x-ray imaging.
Conclusions:
- The electrophoretic fabrication method overcomes key limitations of CNT field emitters.
- The developed CNT cathodes show superior performance for demanding applications.
- This technology enables advancements in high-resolution x-ray imaging systems.
